<template>
    <div>
        <home-header v-if="this.$store.state.search"></home-header>
        <div class="icons">
            <swiper :options="swiperOptions" v-if="showSwiper">
                <swiper-slide v-for="(item, index) of food" :key="item.food_id">
                    <div
                            class="icon"
                            v-for="item of food"
                            :key="item.food_id"
                            @click="reflesh"
                    >
                      <router-link :to="{name: '/Fooddetail', params:{id:item.food_id}}">
                        <div class="icon-img">
                            <img
                                    class="icon-img-content"
                                    :src="item.food_picture"
                            >
                        </div>
                        <p class="content">{{item.food_content}}</p>
                        <p class="icon-desc">【{{item.food_title}}】</p>
                      </router-link>
                        </div>
                </swiper-slide>
            </swiper>
        </div>
        <div class="end">
            敬请期待更多的美食...
        </div>
        <img v-if="btnFlag" class="go-top" src="../../../assets/images/top.png"  @click="backTop">
    </div>
</template>

<script>
    import HomeHeader from '../../home/components/Header'
    import axios from 'axios'
    export default {
        name: "FoodFoods",
        props:{
          search:Boolean
        },
        components: {
          HomeHeader
        },
        data () {
            return {
                food: [],
                food_id: '',
                food_picture: '',
                food_title:'',
                food_content: '',
                btnFlag:false,
                scrollTop:2,
                moveOffset:0,
                swiperOptions: {
                    pagination: '.swiper-pagination',
                    loop: true
                }
            }
        },
        mounted(){
            axios.get('/api/food/index.html')
                .then((res) => {
                    console.log(res);
                    this.food = res.data.data.data;
                })
                .catch((err) => {
                    console.log(err);
                });
            window.addEventListener('scroll', this.scrollToTop)
        },
        destroyed(){
            window.removeEventListener('scroll', this.scrollToTop)
        },
        computed: {
            //轮播icons
            pages () {
                const pages = []
                this.iconList.forEach((item,index) =>{
                    const page = Math.floor(index / 8)
                    if (!pages[page]) {
                        pages[page] = []
                    }
                    pages[page].push(item)
                })
                return pages
            },
            showSwiper () {
                return this.food.length//解决了自动滚动效果
            }
        },
        methods: {

            reflesh(){
                location.reload()
            },
            // 点击图片回到顶部方法，加计时器是为了过渡顺滑
            backTop () {
                const that = this;
                let timer = setInterval(() => {
                    let ispeed = Math.floor(-that.scrollTop / 5)
                    document.documentElement.scrollTop = document.body.scrollTop = that.scrollTop + ispeed
                    if (that.scrollTop === 0) {
                        clearInterval(timer)
                    }
                }, 16)
            },
            // 为了计算距离顶部的高度，当高度大于60显示回顶部图标，小于60则隐藏
            scrollToTop () {
                const that = this;
                // 页面滚动距顶部距离
                let scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop
                var scroll = scrollTop - that.moveOffset;
                that.moveOffset = scrollTop;
                that.scrollTop = scrollTop
                if (scroll > 0) {
                    // 向上滑动
                    that.btnFlag = true
                } else {
                    // 向下滑动
                    that.btnFlag = false
                }
            }
        }
    }
</script>

<style lang="stylus" scoped>
    @import '~styles/varibles.styl'
    @import '~styles/mixins.styl'
    .end
        text-align: center;
        margin-top: 25px;
        margin-bottom: 30px;
    .go-top
        width: 0.96rem ;
        height: 0.96rem;
        position: fixed;
        bottom: 1.11rem;
        right: 0.67rem;

    .title
        margin-top .2rem
        line-height .8rem
        background #eee
        text-indent .2rem
    .icons
        margin-top .2rem
        .icon
            position: relative;
            overflow: hidden;
            width: 45%;
            right: 0;
            height: 0;
            float: left;
            padding-bottom: 70%;
            margin-top: 10px;
            margin-left: 12px;
            background: #eee;
            border-radius: 35px;
            .icon-img
                position absolute
                top 0
                left 0
                right 0
                bottom 50px
                box-sizing border-box
                padding 5px
                .icon-img-content
                    display block
                    margin 0 auto
                    height 100%
            .icon-desc
                position absolute
                left 0
                right 0
                bottom 0
                height 22px
                line-height 22px
                text-align center
                color $darkTextColor
                ellipsis()
            .content
                margin-top: 216px;
                margin-left: 6px;
                ellipsis()
</style>
